Construction of reinforced-concrete-slab roofs for buildings



J. H. DE W. WALLER. CONSTRUCTION or REDNFORCEDCONCRETE SLAB ROOFS FOR BUILDINGS.

I \PPHCATION FILED FEB. 17, I920- 1,367,289.

Patented Feb. 1, 1921.

UNITED STATES lfATENT OFFICE.

JAMES H. DE W. WALLER, OF DUBLIN, IRELAND.

Specification of Letters Patent.

Patented Feb. 1, 1921'.

Application filed February 17, 1920. Serial No. 359,363.

To all whom it may concern:

Be it known that I, JAMES Hannnnss on VARRENNE WALLnn, a subject of the King of England, residing at 115 Grafton street, Dublin, Ireland, (whose post-oflice address is 115 Grafton street, Dublin, Ireland,) have invented certain new and useful Improve ments in the Construction of Reinforced- Concrete-Slab Roofs for Buildings, of which the following is a specification.

This invention relates to the construction of roofs for huts, houses, factories, mills, and the like buildings from pro-cast reinforced concrete slabs.

According to this invention the roof is composed of a couple formed of a ceiling joist and two roof sections all three being precast.

The ceiling joist is cast with upturned projec-ting ends against which butt the lower ends of rafters cast on the roof sections and above the joints are placed tiles or reinforced concrete capping;

In the accompanying drawings Figure 1 is an end elevation of part of a building showing my invention applied thereto each roof section bein supported in a slightly different way to the other;

Fig. 2 is a diagrammatic end elevation showing the roof couple; and

Fig. 3 is an isometrical projection of the 1 plane of section 3-3 in Fig. 9..

The same letters of reference where they occur are used to denote the same or corresponding parts in all three figures of the drawings.

The parts of the roof couple are two sections H and a ceiling joist I having haunched or upturned ends I.

As will be seen in Fig. 3 each roof section consists of a slab portion J which has formed on the upper side of each of its edges. ex-

cept that edge which forms the eave a raised weathering or beading K and on its lower sides rafters L having faces which abut against the haunched ends I of the ceiling joists I or against shoulders C on wallplates C (Fig. 1) which latter are cast in position so as to tie in the ceiling joists. ()n the ends of the roof sections which form the ridge are formed small ridge beams M (Figs. 1 and. 2) which butt against each other and may be formed so as to leave a V-shaped channel N (Fig. 1) running along the ridge of the roof which may be filled with concrete in situ suitably reinforced so as to hold the roof sections and prevent them from separating from each other. Each section of the roof is composed of a series of longitudinal inenibcrs placed side by side, as shown in Fig. 3. the meeting edges of the adjacent headings K being covered with tiles L" running parallel to the slope of the roof and L2 running along the ridge of the roof so as to keep all the parts weatherproof.

Having fully described. my invention, what I claim and desire to secure by Let ters Patent is 1. A reinforced concrete slab roof for buildings composed of pro-cast reinforced concrete slabs forming roof couples comprising ceiling joists having haunched ends and roof sections having rafters on the lower sides and formed with raised weathering on the upper sides, the lower ends of said rafters abutting against the haunchod ends on the joists, and caps on said raised weathering.

2. A reinforced concrete slab roof for buildings composed of precast reinforced concrete slabs forming roof couples comprising ceiling joists having hauuched ends. roof sections having rafters on the lower sides and formed with raised weathering on the upper sides, the lower ends of said rafters abutting against the haunched ends on the joists, and tiles for covering the meeting edges of adjacent-raised weathering on the roof sections.

In testimony whereof I have hereunto set my hand in presence of two subscribing wit ucsses this 23rd day of January, 1920.

J. H. on IVVVALLEB.

\Vitnesses B. COLBY, H. C. CARPENTER.

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